Synthesis and characterization of MnO-doped titanium pyrophosphates (Ti1-x
            Mn
                x
            P2O7; x = 0–0.2) for intermediate-temperature proton-conducting ceramic-electrolyte fuel cells

The reaction of [Cp*TiCl] (Cp* = CMe) with monoalkyl phosphates (RO)POH (R = Me, Et, and Pr) in tetrahydrofuran (THF) at 25 °C leads to the formation of binuclear complexes [Cp*Ti(μ-OP(OH)OR)(μ-OP(O)OR)] [R = Me (1), Et (2), and Pr (3)]. On the other hand, the reaction of (BuO)POK with [Cp*TiCl] in acetonitrile or THF results in isolation of either the dinuclear [Cp*Ti(μ-OP(OH)O Bu)(μ-OP(O)O Bu)] (4) or the trinuclear titanophosphate [Cp*Ti(μ-OPO Bu)(μ-O)(μ-OP(O Bu))] (5), respectively. The formation of compounds 4 and 5 is facilitated by partial hydrolysis of the tert-butoxy groups of ( BuO)POK. New titanophosphates 1-5 have been characterized by spectroscopic and analytical methods, and the molecular structures have further been confirmed by single-crystal X-ray diffraction studies. Thermal decomposition studies of 1-5 reveal the initial loss of thermally labile alkyl substituents of the organophosphate ligands, followed by the loss of CMe groups to form an organic-free amorphous titanophosphate in the temperature range 300-500 °C. This material transforms to highly crystalline titanium pyrophosphate TiPO at 800 °C. Compounds 1-5 and the TiPO materials obtained at 300, 500, and 800 °C through the thermal decomposition of 3 have been employed as efficient homogeneous catalysts for the alkene epoxidation reaction. Using hydrogen peroxide as the oxidant in an acetonitrile medium, these catalysts exhibit >90% alkene conversion with >90% epoxide selectivity in 4 h at temperatures below 100 °C.

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Synthesis and characterization of MnO-doped titanium pyrophosphates (Ti1-x Mn x P2O7; x = 0–0.2) for intermediate-temperature proton-conducting ceramic-electrolyte fuel cells

Cited by 5 publications

References 44 publications

Fabrication of dense Ce0.9Mg0.1P2O7-PmOn composites by microwave heating for application as electrolyte in intermediate-temperature fuel cells

Fabrication of dense Ce0.9Mg0.1P2O7-PmOn composites by microwave heating for application as electrolyte in intermediate-temperature fuel cells

Novel organic-inorganic polyphosphate based composite material as highly dense and robust electrolyte for low temperature fuel cells

Thermolabile Organotitanium Monoalkyl Phosphates: Synthesis, Structures, and Utility as Epoxidation Catalysts and Single-Source Precursors for TiP₂O₇

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Synthesis and characterization of MnO-doped titanium pyrophosphates (Ti1-x Mn x P2O7; x = 0–0.2) for intermediate-temperature proton-conducting ceramic-electrolyte fuel cells

Cited by 5 publications

References 44 publications

Fabrication of dense Ce0.9Mg0.1P2O7-PmOn composites by microwave heating for application as electrolyte in intermediate-temperature fuel cells

Fabrication of dense Ce0.9Mg0.1P2O7-PmOn composites by microwave heating for application as electrolyte in intermediate-temperature fuel cells

Novel organic-inorganic polyphosphate based composite material as highly dense and robust electrolyte for low temperature fuel cells

Thermolabile Organotitanium Monoalkyl Phosphates: Synthesis, Structures, and Utility as Epoxidation Catalysts and Single-Source Precursors for TiP2O7

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Thermolabile Organotitanium Monoalkyl Phosphates: Synthesis, Structures, and Utility as Epoxidation Catalysts and Single-Source Precursors for TiP₂O₇